Case study:Apelnäs fishway at River Rolfså

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Location: 57° 37' 54", 12° 29' 47"
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Project overview

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Status Complete
Project web site
Themes Fisheries, Habitat and biodiversity, Hydropower
Country Sweden
Main contact forename Andreas
Main contact surname Bäckstrand
Main contact user ID User:Arolam
Contact organisation Länsstyrelsen västra Götalands län
Contact organisation web site http://
Partner organisations
Parent multi-site project

Case_study:Biologisk återställning i Rolfsåns vattensystem

This is a parent project
encompassing the following
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Project summary

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The Apelnäs powerplant was built in 1940. In 1995 a denil fishway was built and adapted for a minimum amount of water 300 L/s. A fish counter was placed at the upper end of the fishway. It was noticed that fish only migrated downstream, not upstream. The reason was that the fish could not find the fishway and there was still too little amount of water. A pool-type fishway (on left-hand side in the picture) was decided to build because it was not possible to build a bypass channel because of steep steepness and rock-bedded bottom. The realisation of the new fishway was 2009. After the finish of the pool-type fishway, the water flow was increased from 300 to 600 L/s for two months annually. In addition, the power plant will every September and October be turned off entirely for 10 hours on one day a week. This will provide an attraction flow for migrating trout during its spawning time.

To consider the eel, the top of the fishway walls were made slope and a little amount of water was entered to there. The idea was to have moss growing there, since it is excellent climbing material for eels. Also some 50 mm holes were made to the walll of the fishway to help the migrating eels to swim through them.

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Catchment and subcatchment


River basin district Skagerrak and Kattegat River basin
River basin Rolfsån River Basin


River name River Rolfsån
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology Organic (i.e. Peat)
Ecoregion Fenno-Scandian Shield
Dominant land cover Woodland, Intensive agriculture (arable)
Waterbody ID

Other case studies in this subcatchment: Biologisk återställning i Rolfsåns vattensystem, Bosgården nature-like fishway at River Rolfså, Dam removal at Grönkullen, River Rolfsån, Restorations of River Nolån-Hulta dam removal, ´Restorations of River Nolån-Bypass channel in Hulta Hydro power plant, ´Restorations of River Nolån-Fishway in Forsa hydro power plant, Ålgårda nature-like bypass channel at River Rolfsån


Name Apelnäs hydropowerplant at river Storån
WFD water body codes
WFD (national) typology
WFD water body name River Storån
Pre-project morphology Artificial bed
Reference morphology Pool fishway
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest Brown trout (Salmo trutta), European eel (Anguilla anguilla)
Dominant hydrology Artificially regulated
Dominant substrate Bedrock
River corridor land use Woodland, Intensive agriculture (arable)
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category 1 - 10 m³/s
Mean annual discharge (m3/s) 6
6 m³/s
6,000 l/s
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

Reach length directly affected (m)
Project started 2008
Works started
Works completed
Project completed 2009/12/31
Total cost category 1000 - 5000 k€
Total cost (k€) 1200
1,200 k€
1,200,000 €
Benefit to cost ratio
Funding sources

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance

Supplementary funding information

The building of the fishway cost 1 milj. Swedish crones (ca. 100 000 euros) and the habitat restoration 84 000 Swedish crones (ca. 8400 euros).

Reasons for river restoration

Mitigation of a pressure Mitigation of hydropower and creating more spawning habitats for migrating fish
Other reasons for the project


Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
Non-structural measures
Management interventions
Social measures (incl. engagement)


Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

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Physico-chemical quality elements

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Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
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Monitoring documents

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Supplementary Information

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